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排序方式: 共有179条查询结果,搜索用时 15 毫秒
81.
Pirker KF Oliveira J de Freitas V Goodman BA Mateus N 《Journal of agricultural and food chemistry》2011,59(21):11833-11837
The free radical chemistry of two polyphenolic pigments from red wine, belonging to the family of portisins, has been investigated after reaction with O(2)(?-) radicals using electron paramagnetic resonance (EPR) spectroscopy. Two portisins derived from malvidin-3-glucoside and cyanidin-3-glucoside were used for this study. Stable free radicals were detected with both portisins and correspond to unpaired electrons localized on the B as well as F rings of the portisins. Interpretations were confirmed by comparison with the spectra of free radicals formed by oxidation of the model compounds cyanidin-3-glucoside, malvidin-3-glucoside, and catechin. These results concur with previous work reporting the higher antiradical properties of these pigments compared to their anthocyanin precursors. 相似文献
82.
Martins J Esteves C Simoes T Correia M Delerue-Matos C 《Journal of agricultural and food chemistry》2011,59(13):6847-6855
The present work describes a solid-phase microextraction (SPME) gas chromatography-tandem mass spectrometry (MS/MS) method to quantify 24 pesticides in fortified white wine and fortified red wine. In this study "fortified wine" refers to a wine in which fermentation is arrested before completion by alcohol distillate addition, allowing sugar and alcoholic contents to be higher (around 80-100 g/L total sugars and 19-22% alcohol strength (v/v)). The analytical method showed good linearity, presenting correlation coefficients (R(2)) ≥ 0.989 for all compounds. Limits of detection (LOD) and quantitation (LOQ) in the ranges of 0.05-72.35 and 0.16-219.23 μg/L, respectively, were obtained. LOQs are below the maximum residue levels (MRL) set by European Regulation for grapes. The proposed method was applied to 17 commercial fortified wines. The analyzed pesticides were not detected in the wines tested. 相似文献
83.
Gardner MJ Bishop R Shah T de Villiers EP Carlton JM Hall N Ren Q Paulsen IT Pain A Berriman M Wilson RJ Sato S Ralph SA Mann DJ Xiong Z Shallom SJ Weidman J Jiang L Lynn J Weaver B Shoaibi A Domingo AR Wasawo D Crabtree J Wortman JR Haas B Angiuoli SV Creasy TH Lu C Suh B Silva JC Utterback TR Feldblyum TV Pertea M Allen J Nierman WC Taracha EL Salzberg SL White OR Fitzhugh HA Morzaria S Venter JC Fraser CM Nene V 《Science (New York, N.Y.)》2005,309(5731):134-137
We report the genome sequence of Theileria parva, an apicomplexan pathogen causing economic losses to smallholder farmers in Africa. The parasite chromosomes exhibit limited conservation of gene synteny with Plasmodium falciparum, and its plastid-like genome represents the first example where all apicoplast genes are encoded on one DNA strand. We tentatively identify proteins that facilitate parasite segregation during host cell cytokinesis and contribute to persistent infection of transformed host cells. Several biosynthetic pathways are incomplete or absent, suggesting substantial metabolic dependence on the host cell. One protein family that may generate parasite antigenic diversity is not telomere-associated. 相似文献
84.
Cahyaningsih Ria Magos Brehm Joana Maxted Nigel 《Genetic Resources and Crop Evolution》2021,68(5):2019-2050
Genetic Resources and Crop Evolution - Setting priority species for conservation planning in a large and biodiverse country such as Indonesia is crucial. At least 80% of the medicinal plant species... 相似文献
85.
Martins DA Engrola S Morais S Bandarra N Coutinho J Yúfera M Conceição LE 《Fish physiology and biochemistry》2011,37(4):733-743
An experiment was conducted in order to evaluate the effects of feeding frozen Artemia diets differing in arachidonic acid-to-eicosapentaenoic acid ratios (ARA/EPA) on growth, survival and stress coping ability
of Senegalese sole post-larvae (19–31 days after hatch). Two experimental diets presenting high (‘High’; 3.0) or low (‘Low’;
0.7) ARA/EPA ratios were tested under two rearing conditions: undisturbed (C) and stressed by a 2-min air exposure every two
days (S). Growth, survival and basal cortisol levels were similar between groups indicating that independently of dietary
ARA/EPA ratios, fish were able to cope with the repeated stress imposed. Also, cortisol levels at 3 h past air exposure were
determined in all groups at the end of the experiment. Among fish fed the ‘Low’ diet, C groups seemed to present a quicker
recovery from the acute stress (basal-like levels) than S groups. Repeated stress effects were not apparent in fish fed the
‘High’ diet and, relative to basal levels, twofold higher cortisol concentrations were detected at 3 h, in both C and S groups.
This study suggests the importance of ARA in steroidogenesis regulation and the modulatory role of EPA in this process. Despite
the tolerance to a wide range of dietary ARA/EPA as indicated by growth and survival results, acute stress coping response
may be more efficient in Senegalese sole post-larvae fed low ARA/EPA ratios and, under these particular conditions, a faster
recovery of cortisol to basal values could be indicative of rearing conditions (undisturbed vs. repeatedly stressed). 相似文献
86.
Marisa Silva Aldo Barreiro Paula Rodriguez Paz Otero Joana Azevedo Amparo Alfonso Luis M. Botana Vitor Vasconcelos 《Marine drugs》2013,11(6):1936-1960
The prevalence of poisoning events due to harmful algal blooms (HABs) has declined during the last two decades through monitoring programs and legislation, implemented mainly for bivalves. However, new toxin vectors and emergent toxins pose a challenge to public health. Several locations on the Portuguese coast were surveyed between 2009 and 2010 for three distinct biotoxin groups [saxitoxin (PST), spirolide (SPX) and okadaic acid (OA)], in 14 benthic species of mollusks and echinoderms. Our main goals were to detect new vectors and unravel the seasonal and geographical patterns of these toxins. PSTs were analyzed by the Lawrence method, SPXs by LC-MS/MS, and OA by LC-MS/MS and UPLC-MS/MS. We report 16 new vectors for these toxins in the North Atlantic. There were differences in toxin contents among species, but no significant geographical or seasonal patterns were found. Our results suggest that legislation should be adjusted to extend the monitoring of marine toxins to a wider range of species besides edible bivalves. 相似文献
87.
88.
89.
Use of encounter data to model spatio‐temporal distribution patterns of endangered smalltooth sawfish,Pristis pectinata,in the western Atlantic
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John D. Waters Rui Coelho Joana Fernandez‐Carvalho Amy A. Timmers Tonya Wiley Jason C. Seitz Matthew T. Mcdavitt George H. Burgess Gregg R. Poulakis 《水产资源保护:海洋与淡水生态系统》2014,24(6):760-776
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90.
Joana D. M. de S Jos A. Pereira Tida Dethoup Honorina Cidade Maria Emília Sousa Inês C. Rodrigues Paulo M. Costa Sharad Mistry Artur M. S. Silva Anake Kijjoa 《Marine drugs》2021,19(8)
Previously unreported anthraquinone, acetylpenipurdin A (4), biphenyl ether, neospinosic acid (6), dibenzodioxepinone, and spinolactone (7) were isolated, together with (R)-6-hydroxymellein (1), penipurdin A (2), acetylquestinol (3), tenellic acid C (5), and vermixocin A (8) from the culture of a marine sponge-associated fungus Neosartorya spinosa KUFA1047. The structures of the previously unreported compounds were established based on an extensive analysis of 1D and 2D NMR spectra as well as HRMS data. The absolute configurations of the stereogenic centers of 5 and 7 were established unambiguously by comparing their calculated and experimental electronic circular dichroism (ECD) spectra. Compounds 2 and 5–8 were tested for their in vitro acetylcholinesterase and tyrosinase inhibitory activities as well as their antibacterial activity against Gram-positive and Gram-negative reference, and multidrug-resistant strains isolated from the environment. The tested compounds were also evaluated for their capacity to inhibit biofilm formation in the reference strains. 相似文献